Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Balance at Mar. 31, 2019	$ 34,055	$ 3,338	$ 142,260	$ (111,543)
Balance (in shares) at Mar. 31, 2019		33,377
Increase (Decrease) in Stockholders' Equity
Issuance of common stock in connection with public offering, net of costs	26,751	$ 618	26,133
Issuance of common stock in connection with public offering, net of costs (in shares)		6,183
Stock option exercises	256	$ 12	244
Stock option exercises (in shares)		120
Issuance of shares pursuant to Employee Stock Purchase Plan	370	$ 9	361
Issuance of shares pursuant to Employee Stock Purchase Plan (in shares)		91
Stock-based compensation	2,785		2,785
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes	(15)	$ 7	(22)
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes (in shares)		73
Issuance of common stock in connection with acquisition	4,535	$ 87	4,448
Issuance of common stock in connection with acquisition (in shares)		869
Net income (loss)	(5,610)			(5,610)
Balance at Mar. 31, 2020	63,127	$ 4,071	176,209	(117,153)
Balance (in shares) at Mar. 31, 2020		40,713
Increase (Decrease) in Stockholders' Equity
Stock option exercises	2,633	$ 74	2,559
Stock option exercises (in shares)		731
Issuance of shares pursuant to Employee Stock Purchase Plan	448	$ 10	438
Issuance of shares pursuant to Employee Stock Purchase Plan (in shares)		97
Stock-based compensation	2,845		2,845
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes	(208)	$ 15	(223)
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes (in shares)		146
Net income (loss)	10,134			10,134
Balance at Mar. 31, 2021	$ 78,979	$ 4,170	181,828	(107,019)
Balance (in shares) at Mar. 31, 2021	41,687	41,687
Increase (Decrease) in Stockholders' Equity
Stock option exercises	$ 1,330	$ 48	1,282
Stock option exercises (in shares)		489
Issuance of shares pursuant to Employee Stock Purchase Plan	436	$ 9	427
Issuance of shares pursuant to Employee Stock Purchase Plan (in shares)		95
Stock-based compensation	3,401		3,401
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes	(203)	$ 15	(218)
Issuance of shares pursuant to vesting of restricted stock units, net of payroll withholding taxes (in shares)		145
Net income (loss)	(7,080)			(7,080)
Balance at Mar. 31, 2022	$ 76,863	$ 4,242	$ 186,720	$ (114,099)
Balance (in shares) at Mar. 31, 2022	42,416	42,416